\centering
\begin{tabular}[t]{lcccc}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{2}{c}{\makecell[c]{Predicted prob. of others\\selecting trans\\(within-group, outcome round)}} & \multicolumn{2}{c}{\makecell[c]{Chose trans in private\\outcome round (=1)}} \\
\cmidrule(l{3pt}r{3pt}){2-3} \cmidrule(l{3pt}r{3pt}){4-5}
  & (1) & (2) & (3) & (4)\\
\midrule
Observer (No discussion, public) & \num{0.045}* & \num{-0.176}*** & \num{0.045}** & \num{-0.091}**\\
 & (\num{0.026}) & (\num{0.042}) & (\num{0.022}) & (\num{0.039})\\
 & {}[\num{0.079}] & {}[\num{<0.001}] & {}[\num{0.038}] & {}[\num{0.022}]\\
$\pi_{-i}$ = P(others in group selected trans in treatment round) &  & \num{0.034} &  & \num{-0.032}\\
 &  & (\num{0.038}) &  & (\num{0.037})\\
 &  & {}[\num{0.374}] &  & {}[\num{0.385}]\\
$\pi_{-i}$ $\times$ Observer (No discussion, public) &  & \num{0.434}*** &  & \num{0.258}***\\
 &  & (\num{0.077}) &  & (\num{0.069})\\
 &  & {}[\num{<0.001}] &  & {}[\num{<0.001}]\\
\midrule
Num. observations & \num{3487} & \num{3487} & \num{3516} & \num{3516}\\
Num. participants & \num{1748} & \num{1748} & \num{1758} & \num{1758}\\
Num. groups & \num{654} & \num{654} & \num{654} & \num{654}\\
Outcome mean: No discuss. (priv.) & \num{0.36} & \num{0.36} & \num{0.42} & \num{0.42}\\
Controls & X & X & X & X\\
\bottomrule

\end{tabular}

